21301332 has 24 divisors (see below), whose sum is σ = 53526816. Its totient is φ = 6554208.

The previous prime is 21301331. The next prime is 21301339. The reversal of 21301332 is 23310312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68118 + ... + 68429.

It is an arithmetic number, because the mean of its divisors is an integer number (2230284).

Almost surely, 2^21301332 is an apocalyptic number.

It is an amenable number.

21301332 is an abundant number, since it is smaller than the sum of its proper divisors (32225484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21301332 is a wasteful number, since it uses less digits than its factorization.

21301332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136567 (or 136565 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21301332 is about 4615.3366074426. The cubic root of 21301332 is about 277.2057623076.

Adding to 21301332 its reverse (23310312), we get a palindrome (44611644).

The spelling of 21301332 in words is "twenty-one million, three hundred one thousand, three hundred thirty-two".